Zeiss Dimension Manuel D'utilisation page 23

• Turn the front part of the lens to adjust the back focal
distance and observe the image on the display or monitor to
ensure maximum image sharpness. The lens can be turned
clockwise and anticlockwise, starting from the factory setting.
Mechanical stops clearly indicate the limits of the adjustment
range.
• After adjusting the back focal distance to achieve maximum
image sharpness, tighten the three grub screws finger-tight
with the hex key.
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